What is Additional Authentication and How can I fix it?

Hi Dalton!

What exactly is your Xbox console model? When did this issue start to occur?

Try to power cycle your console to clear the system cache. Press and hold Xbox's power button for 10 sec until it turns off. Unplug the power supply for 30 sec. Plug it back in and turn it on again.

Please do the same on your router. Unplug it for at least a minute before turning it back on.

Me too, internet is connected but says NAT issue. Was connected last night until late and not working all day todaynas well

Thats what happend to me to still cant play so i bought a tank and destroyed my xbox and its fixed im kidding but i do have the problem i cant go online it says my NAT or something about my internet but my internet is connected with other devices so somethings
wrong with the xbox hopefully when i wake uo its fixes.

Me too, internet is connected but says NAT issue. Was connected last night until late and not working all day todaynas well

Are you connecting in a student dorm WiFi, or an apartment complex that provides WiFi to the inhabitants? It might be, that when you first connected your other devices to the network, you were presented with a welcome page,
where you had to authenticate your devices by agreeing to the WiFi's terms of use, or provide a code or password you got from your landlord or whoever runs the WiFi.

Since that has to be only once, you might have forgotten about it.

If you try to connect the Xbox One to that network, it might require you to visit the portal page again, and authenticate the Xbox access with the WiFi.

https://answers.microsoft.com/en-us/xbox/forum/xba_console/running-into-the-additional-authentication-needed/28cadd69-6f5f-41fa-a5ba-05d5514e9af7

Hope this helps